240 Trans. Acad. Sci. of St. Louis. 



more than right but very distinct, the surface minutely and sparsely 

 punctulate, broadly concave in the male, somewhat flattened in the 

 female ; antennae rather stout, but feebly incrassate distally, extending 

 fully to the middle of the elytra, the third joint much longer than the 

 first or second, the subaplcal joints fully as long as wide; prothorar 

 distinctly narrower than the head iu both sexes, very slightly longer 

 than wide, the sides evenly rounded anteriorly, thence very strongly 

 converging and just visibly, broadly sinuate to the base, the surface, 

 like that of the head, devoid of minute ground sculpture, very minutely 

 and sparsely punctulate throughout, the sulcus very deep, impressed; 

 scutellum minutely, densely rugulose; elytra four-flfths wider but 

 scarcely a fourth longer than the prothorax, the humeri very widely 

 exposed and oblique at base, the sides very feebly diverging from base 

 to apex, arcuate, the surface convex, having a ground sculpture of 

 minute lines forming rather coarse reticulations, also finely, sparsely 

 and asperulately punctured throughout, the suture linearly impressed 

 just behind the scutellum; abdomen very minutely, feebly reticulate in 

 wavy transverse lines, the basal impressions wholly impunctate except 

 the first, which has a few widely spaced coarse punctures, the sides 

 parallel and distinctly arcuate, at the middle subequal in width to the 

 elytra; legs long, moderately slender, the basal joint of the hind tarsi 

 equal in length to the next three combined, the latter decreasing uni- 

 formly and slowly in length; claws rather short, slender. Length 3.2 

 mm.; width 0.75 mm. New Mexico (Las Vegas) and Arizona (Flag- 

 staff) caviceps n. sp. 



Form somewhat less stout, convex, polished, dark rufo-piceous in color, 

 the head and elytra slightly more blackish than the prothorax; legs 

 piceo-testaceous, paler distally, the antennae fuscous, gradually pale 

 basally; vestiture sparse and inconspicuous; head slightly wider than 

 long, the sides at first feebly converging behind the eyes, then very 

 broadly rounded into the less arcuate base, the angles obliterated; sur- 

 face minutely, sparsely punctulate, broadly flattened or feebly concave, 

 the anteunae moderately stout, scarcely visibly incrassate distally, 

 long, extending fully to the end of the elytra, the second and third 

 joints subequal, the outer joints fully as long as wide, the sparse erect 

 bristles rather conspicuous throughout ; prothorax nearly as In caviteps 

 but narrower and distinctly more elongate with the strongly converg- 

 ing sides straight, slightly narrower than the head, similarly deeply 

 sulcate and finely, sparsely punctulate; scutellum finely, densely ruga- 

 lose; elytra nearly similar in form but with the surface perfectly 

 smooth, like the anterior parts, and not micro-reticulate and with the 

 very sparse punctulation not asperulate and scarcely perceptible, the 

 post-scutellar impression small and deep; abdomen parallel with 

 arcuate sides, everywhere distinctly narrower than the elytra, finely 

 and feebly micro-reticulate, the first impression coarsely and densely 

 punctured at the bottom, the second and third much narrower than 

 the first and impunctate or very sparsely and obsoletely so; legs long 

 and slender, the femora not as thick as in caviceps, the hind tarsi 

 longer and more slender, three-fourths as long as the tibiae, the basal 



